The mean of a set of eight numbers is 63. If one of the numbers is discarded, the mean of the remaining numbers is 58. The value of discarded number is:
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 98
Mean = Sum of total numbers/Total numbers
A/c to ques the mean of a set of eight numbers is 63
⇒ Sum of set of eight numbers = 63 × 8 = 504
⇒ If one of the numbers is discarded, the mean of the remaining numbers is 58
Sum of set of seven numbers = 58 × 7 = 406
Discarded number is 504 - 406 = 98.